-
公开(公告)号：US11486706B2
公开(公告)日：2022-11-01
申请号：US16858272
申请日：2020-04-24
Applicant: Honeywell International Inc.
Inventor： Jianfeng Wu , Matthew Wade Puckett , Karl D. Nelson
Abstract: A method for reducing or eliminating bias instability in a SBS laser gyroscope comprises introducing a first pump signal propagating in a CW direction, and a second pump signal propagating in a CCW direction in a resonator; generating a CCW first-order SBS signal and a CW first-order SBS signal in the resonator; increasing a power level of the first pump signal above a threshold level such that the CW first-order SBS signal generates a CCW second-order SBS signal; and increasing a power level of the second pump signal above the threshold level such that the CCW first-order SBS signal generates a CW second-order SBS signal. Above the threshold level, an intensity fluctuation of the first-order SBS signals disappear and their DC power are clamped at substantially the same power level. A Kerr effect bias instability of the SBS laser gyroscope is reduced or eliminated by the clamped first-order SBS signals.
-
22.发明授权公开(公告)号：US11429010B1
公开(公告)日：2022-08-30
申请号：US17412002
申请日：2021-08-25
Applicant: Honeywell International Inc.
Inventor： Matthew Wade Puckett , Jianfeng Wu , Karl D. Nelson , Chad Hoyt
Abstract: Systems and methods for a tunable radio frequency synthesizer utilizing optical frequency combs are provided. In one embodiment, an RF signal generator comprises: an SBS pump laser segment including a first and second SBS pump laser each generating SBS laser light at different respective frequencies; a TE/TM dual comb resonator comprising a comb optical resonator coupled to the first and second SBS pump lasers, wherein the comb optical resonator generates a pair of counter-propagating optical frequency combs of different polarities from the SBS laser light; a filter resonator segment configured to provide feedback to the TE/TM dual comb resonator to lock a relative position of the pair of counter-propagating optical frequency combs, the filter resonator comprising a tunable optical filter to output a discrete tuned RF signal output based on a comb line pair that includes a single comb line from each of the pair of counter-propagating optical frequency combs.
-
公开(公告)号：US20220252400A1
公开(公告)日：2022-08-11
申请号：US17171858
申请日：2021-02-09
Applicant: Honeywell International Inc.
Inventor： Jianfeng Wu , Matthew Wade Puckett , Karl D. Nelson
Abstract: Techniques for reducing the bias error present in optical gyroscopes is disclosed. Such techniques include at least one path length adjustment member placed in an optical gyroscope resonator, which are configured to modulate the optical path length of the resonator so that bias errors attributable to the optical path length are shifted outside of the bandwidth of the optical gyroscope. In some embodiments, the at least one path length adjustment member includes a plurality of microheaters coupled to the resonator, in which case optical path length modulation is achieved by heating the resonator via the microheaters. Alternatively, a plurality of piezo-electric regions can be placed in the resonator, which enables optical path length modulation through electric field gradients applied to the piezo-electric regions.
-
公开(公告)号：US11002545B2
公开(公告)日：2021-05-11
申请号：US16546115
申请日：2019-08-20
Applicant: Honeywell International Inc.
Inventor： Lee K. Strandjord , Glen A. Sanders , Jianfeng Wu , Tiequn Qiu , Marc Smiciklas
IPC: G01C19/72
Abstract: Systems and methods for performing SHD switching for RFOGS are provided herein. A system includes a resonator in which light resonates; at least one laser source that produces first and second optical beams; heterodyne modulators that modulate the first and second optical beams at a heterodyne frequency plus a modulation frequency offset to produce multiple sideband optical beams, wherein the modulation frequency offset has a different sign for the first and second optical beams; a frequency switching controller that alternatingly switches the signs of the modulation frequency offset applied to the first and second optical beams, wherein the heterodyne modulation of the first and second optical beams are on average at the heterodyne frequency; at least one coupler that couples the sideband optical beams into the resonator; a feedback control that detects the sideband optical beams transmitted from the resonator and, in response, adjusts frequencies of the optical beams.
-
公开(公告)号：US10992097B2
公开(公告)日：2021-04-27
申请号：US15618833
申请日：2017-06-09
Applicant: Honeywell International Inc.
Inventor： Matthew Wade Puckett , Karl D. Nelson , Jianfeng Wu
Abstract: An apparatus is provided. The apparatus comprises: an optical resonator including a surface; wherein a Bragg grating is formed at least part of the surface of the optical resonator; and wherein the Bragg grating has a Bragg frequency substantially equal to a center frequency of an Nth order Brillouin gain region capable of generating an Nth order Stokes signal.
-
Patent Agency Ranking
公开(公告)号：US20210080549A1
公开(公告)日：2021-03-18
申请号：US16569581
申请日：2019-09-12
Applicant: Honeywell International Inc.
Inventor： Steven Tin , Chad Fertig , Matthew Wade Puckett , Neil A. Krueger , Jianfeng Wu
Abstract: A sensor system comprises a pulsed light source, and a passive sensor head chip in communication with the light source. The sensor head chip includes a first photonics substrate, a transmitting optical component on the first photonics substrate and configured to couple a pulse, transmitted through a first optical fiber from the light source, into a region of interest; and a receiving optical component on the first photonics substrate and configured to couple backscattered light, received from the region of interest, into a second optical fiber. A signal processing chip communicates with the sensor head chip and light source. The signal processing chip includes a second photonics substrate and comprises a passive optical filter array that receives the backscattered light from the second optical fiber. The filter array includes notch filters in communication with each other and operative for frequency selection; and optical detectors respectively coupled to the notch filters.
-
公开(公告)号：US10907967B1
公开(公告)日：2021-02-02
申请号：US16591484
申请日：2019-10-02
Applicant: Honeywell International Inc.
Inventor： Jianfeng Wu , Karl D. Nelson , Teresa Marta , Alan Bruce Touchberry
IPC: G01C19/66
Abstract: A ring laser gyroscope comprises an optical block that defines an optical closed loop pathway; at least one mirror structure mounted on the optical block and in communication with the closed loop pathway; at least one volume Bragg grating mounted on the optical block and in communication with the closed loop pathway; and a pump laser in communication with the volume Bragg grating, the laser operative to emit a light beam at a selected incident angle such that the beam passes through the volume Bragg grating and overlaps with the closed loop pathway. The volume Bragg grating is operative as a gain medium to increase an optical power of the beam, and a pair of counter-propagating beams is produced within the closed loop pathway from the beam. The mirror structure and the volume Bragg grating are positioned and angled to reflect the counter-propagating beams around the closed loop pathway.
-
公开(公告)号：US20210025708A1
公开(公告)日：2021-01-28
申请号：US16734038
申请日：2020-01-03
Applicant: Honeywell International Inc.
Inventor： Lee K. Strandjord , Marc Smiciklas , Jianfeng Wu , Glen A. Sanders
Abstract: Systems and methods for performing resonator fiber optic gyroscope (RFOG) resonance hopping are described herein. For example, an RFOG includes a fiber optic resonator. The RFOG also includes a plurality of laser sources that each launch a respective laser for propagation within the fiber optic resonator. Further, the RFOG includes a threshold detector that determines when the operation of at least one laser source in the plurality of laser sources exceeds a threshold associated with the operational range of an aspect of the at least one laser source. Additionally, the RFOG includes a hop control logic that adjusts the frequency of at least one laser produced by the at least one laser source one or more resonant modes of the fiber optic resonator such that the aspect of the at least one laser moves away from the threshold towards a nominal value within the operational range.
-
公开(公告)号：US10823571B1
公开(公告)日：2020-11-03
申请号：US16527989
申请日：2019-07-31
Applicant: Honeywell International Inc.
Inventor： Jianfeng Wu , Karl D. Nelson , Matthew Wade Puckett
Abstract: A ring-laser gyroscope which generates in an optical ring resonator and in response to a first pump beam, a first back-scattered beam propagating in a direction; generates in the optical ring resonator and in response to a second pumped beam, a second back-scattered beam propagating in an opposite direction; determines a first difference between the frequencies of the first and second back-scattered beams; reverses the directions of the first and second back-scattered beams; determines a second difference between the frequencies of the first and second back-scattered beams; determines a third difference between the first and second differences; and determines a rotation of the optical ring resonator in response to the third difference.
-
公开(公告)号：US10288429B2
公开(公告)日：2019-05-14
申请号：US15611742
申请日：2017-06-01
Applicant: Honeywell International Inc.
Inventor： Tiequn Qiu , Jianfeng Wu , Matthew Wade Puckett
Abstract: In one embodiment, a method is provided. The method comprises transmitting a first laser pump signal to an optical resonator; adjusting a frequency of the first laser pump signal; generating a first order Stokes signal from the first laser pump signal in an optical resonator; measuring a first beat signal frequency; ceasing transmission of the first laser pump signal to the optical resonator; transmitting a second laser pump signal to the optical resonator; adjusting a frequency of the second laser pump signal; generating a first order Stokes signal from the second laser pump signal in the optical resonator; and measuring a second beat signal frequency; ceasing transmission of the second laser pump signal to the optical resonator.
-
-
-
-
-
-
-
-
-
Search Results
97
records
(took 0.017 seconds)
